Improvement in grinding-mills



s Sheets-Sheet 1. A.'H. WAGNER Grinding-Mill.

No. 205,322. Patented June 25, I878.

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i I l I H HHHHHH WITNESSES I V'V'E/V'TO/i I eflmder new By hisfltforueys Q 7 N. FEIERS PHUYOilTHOGRAPNER, WASHINGTON n C UNITED STATESPATENT QFFICE.

sBERr H. WAGNER, on oHIo eo, ILLINOIS, AssIeNoR To ANNA e. WAGNER, OFsAME PLACE.

IMPROVEMENT IN GRINDING-MILLS.

Specification forming part of Letters Patent N0. 205,322, dated June 25,1878; application filed I May 8, 1878.

To all whom it may concern:

Be it known that I, AUSBERT H. WAGNER, of Chicago, in the county of Cookand State of Illinois, have invented certain new and useful Improvementsin Grinding-Mills, of which the following is a specification:

My invention chiefly relates to improvementsin mills of that class whichare capable of being run either as vertical or horizontal mills, andreadily convertible from the one into the other, and resembles, ingeneral respects, the invention shown and described in Letters Patent ofthe United States granted, upon my application, to my assignee, December11, 1877, No. 197 ,985.

My objects mainly are to improve and to perfect as to details saidpatented mill.

The subject-matter claimed hereinafter specifically will be designated.I

. In the accompanying drawings,- Figure l is a vertical central sectionon the line 1 1 of Fig.2 of my improved mill; Fig. 2, an end elevationthereof, with the frame partly broken away; Fig. 3, a plan or top viewof a portion of the mill, showing the sectional casing, feedsupplyingdevices, 850. Fig.4 is a section on the line 4 4 of Fig. 6, showing thelower or outer section of the casing and the bed-stone orstationary-stone. adjusting devices; Fig. 5, a section on the line 5 5of Fig. 6, with the outer stationary or bed stone in place and partlybroken away; Fig. 6, an inside view,

, representing a plan or elevation, according to the position to whichthe parts may be adjusted, of the casing-section in which thestationary, outer, or 'bed stone is mounted, the stone being removed toshow the adjusting devices; Fig. 7, a face view of said stone, partlybroken away, with its journaled clamping ringor band; and Fig.8 is alongitudinal central section through one of the adj listingbolts and itsattachments, on an enlarged scale.

I have shown all my present improvements as applied to a mill such, inmost respects, as heretofore patented to my assignee, as beforementioned; but some of the improvements are applicableto otherconvertible mills, or those of the general class to which my inventionmore particularly belongs, while others may be applied tonon-convertible mills, or those in which no provision is made forchanging from a horizontal to a vertical driving-spindle, or vloe versa.1 I p I A supporting or main frame is provided with two uprights, A A, across-piece,A and a hinged arm or prop, A The casing is divided into twosections,B B, hinged together at b. One section is provided with aswinging locking-bolt and thumb-nut, [1 adapted to secure the sectionstogether when closed. The sectional casing is suspended in hearings inthe uprights A A by trunnions or journals 1), projecting from. the partB of the casing. The stationary, outer, or bed stone 0 is supported inthe casing-section B by adjusting mechanism, and the .runner orrevolving stone D is supported in the casing-section B by a drivingshaft or spindle, E, on the end of which it is firmly secured. I I

All the parts, as far as described above,are,

both in construction and mode of operation,

the same as, or substantially similar to, the

corresponding parts of the mill shown and described in Letters PatentNo. 197,985, before referred to.

Instead of mounting the spindle E snugly in the pipe-box or longbearing-sleeve F, so as to support it in and for the whole length ofsuch bearing, I form the sleeve F of an internal diameter sufficientlylarge to be loose upon and clear of the spindle E, and do not dependupon it to sustain the spindle, thus avoiding the difficulty of gettinga true bearing of the length of the sleeve. Asin my previous invention,patented as above stated, the spindleinclosing sleeve F is provided witha widened or flattened recessed portion, f, near its outer end, and adriving-pulley, F, is fastened to the spindle and rotates in thisopening in the inclosin g-sleeve, the opposite end of the sleeve beingsecured to the stone-casing and enlarged to receive a bushing, f, inwhich the spindle revolves, as it was suggested it might in said patent.

Instead of mounting the outer end of the spindle directly in the endofthe sleeve, as before, I enlarge the sleeve to provide a box or housing,E in which is fitted an adjustable and removable bushing, E around thespin- I end of the sleeve is supported by the prop A dle end. Thespindle thus finds its bearing in the bushing, which is suitablysecured, as by a set-screw, in the sleeve-housing, so that it may beadjusted as required and removed when too much worn for use. Ascrew-cap, E or other suitable fastening, is secured to the end of thehousing, and protects the bearing and guards against endwise movement ofthe parts. The bushing-retaining set-screw 0 should be fitted loosely inany one of a series of holes in the bushing, so as to leave it free torock slightly both longitudinally and transversely, so as to be selfcentering or adjusting to suit any slight horizontal or verticalmovement of the spindle. The outer or housing as in my former invention,when the mill is used as a horizontal mill, and by the crosspiece A whenrunning as a vertical mill.

By the above construction it will be seen that no particular care isrequired in providin g the sleeve or its enlarged ends or housings forthe bushings f and E the only nice work required being the fittings ofthe bushings and spindle ends.

The stationary, outer, or bed stone adjusting devices resemble in somerespects the mechanism heretofore employed by me in my formerinvention-that is, the stone is hung upon pivots and adjusting-bolts,and a movable plate with cams or inclines is used; but my presentimprovements differ in essential respects from those previouslyemployed.

A'clamping ring or band, C, surrounds the stoneO, and is provided withend flanges or lugs to a and a screw, a, by which the band may beadjusted upon the periphery of the stone and firmly clamped, so as tobalance it, whether horizontal or vertical, upon its pivots or trunnionsc 0, formed with or secured to the band. The stone fits at its eyesomewhat looselyaround the hub H of the casing. The pivots 0 fit so asto be free to rock in bearings in the heads 9 of adjustable screw-boltsG.

The heads 9 are screwed to the bolts, and are adjustable on them. Thesebolts pass through the casing-section B, and are provided with rubberwashers or spring-cushions a and adjusting-nuts, as in my formerinvention. The heads g of the bolts fit and are adjustable by moving thebolts endwise in guideways or sockets G G on the inside wall of thecasing. Beneaththe bolt-heads are adjustable blocks H B, one for eachbolt, through holes in which blocks the bolt-shanks freely pass. Theseblocks have laterally-projecting lugs or shoulders h h, which bear uponthe oppositelyinclined cams or sloping ribs hh at the ends ofacross-plate, H ,'m0ving around the eyehub H. j

The outer ends of the screw rods or bolts G are shouldered, or made withflat or square sides, to adapt them to be turned by a wrench to screwthe rods inwardly or outwardly in the detachable screw-tapped blocks orheads 9. Collars or shoulders, one for each of the rods G, and betweentheir heads and the adjustable shouldered blocks H H, bear upon theseblocks, and confine them against upward movement or from approaching theheads g.

An endwise-moving rod, 1, jointed at its in.- ner end to the adjusting-plate H near one end thereof, serves to rock or turn it about itsaxis to adjust it relatively to the bearing-blocks H H, and enable thestone 0 to be adjusted toward or away from the running-stone. This rodis threaded at its outer end, passes through the casing-wall orperiphery, as in my previous invention, and is provided with an adjustingnut, screw-crank, or hand-wheel, I, and, in ad dition, aspringwasher or rubber-block cushion, P. This washer fits around the rodand between the adj usting-wheel and a stud on the casin g. Its actionis such as always to exert strain on the cam-plate and create a tendencyto move the stone (1 away from the back of the casing or toward therunner, this tendency to move being counteracted under ordinarycircumstances by the rubber washers of the screw-bolts G G, andregulated as desired by adjusting those bolts and the rod 1.

By manipulating the bolts G and the adjusting-rod I, it will be seenthat the stone 0 can be adjusted relatively to the stone D with thegreatest nicety, and secured with the faces of the stones parallel, andat any desired distance apart to suit the mill to the work to be done,and so that the force exerted by the springs or rubber washers a? willbe sufficient to overcome or counterbalance the force exerted by therubber spring 1 and thus keep the stones in proper position unless somehard foreign substance should get between them.

Should a bit of metal, a hard pebble, nail, &c., get between the stones,the additional strain on the inclines h h by the shoulders of thebearing-blocks H H will cause the springcushion I to yield, the rod I tomove inward, and the cam-plate to turn, so as to admit of the separationof the stones far enough to discharge the clogging substance and preventinjury to their faces. This discharge of clogging matter is facilitatedby the rocking of the stone (J upon its pivots. I

The under or bearing surfaces of the shoulders h of the bearing-blocksare rounded to reduce friction, which is also lessened as much aspossible by the employment of suitable metalor alloys for the cams andbearing-blocks.

The cams are kept well lubricated, and preferably have an inclination ofabout thirty degrees. It would take considerable and unusual pressureupon the inclines or cams, especially when the inclination is so slightas represented by the drawings, to move the cams by the thrust action ofthe bearing-shoulders; but when any clogging substance sufficiently hardto seriously injure the stones and resist their grinding action getsbetween their faces, the sudden shock gives a tendency to the bedstoneto jump or violently start away from the runner, and the force thusexerted upon'the inclines of the cam plate I have found by actualpractice to be suflicient to move the cams and invention, patented asbefore mentioned, Iform a detachable skeleton frame or bracket, M, of asingle rod, shaped or bent into a loop or rectangular yoke form, andwith ends on on projecting at right angles, to constitute posts, whichfit in sockets m m on the periphery of the bed-stone casing when themill is operated on a horizontal shaft with the stones vertical; andwhen the stones are arranged horizontally, or run by a vertical shaft,the bracketframe is secured in sockets m m on the back of the bed-stonecasing. The opening to the eye of the stone, when the stone is not usedhorizontally, is closed by a swinging cap or pivoted plate, I. Thehopper rests upon the side bars of the bracket-frame, and delivers thegrain or other substance to be ground to a tray or shoe, N, pivoted upona vibrating lever, O. This leveris operated as in my aforesaid patentedinvention; but instead of being bent at its end, as before, I form itstraight from its fulcrum to the end, where it receives a ferrule orshort tubular rod, 0. This rod is pivoted to lugs on the shoe. When themill is run as a horizontal mill, the connection of the shaking-lever '0with the shoe is made by the employment of an additional lever orconnecting parts. (Not shown herein.) The shoe is supported at its outerend by a hooked or bent rod, P, secured by a collar and set-screw, p, atany required elevation, according to the inclination it is desired togive the shoe-on one of the posts m of the bracket. The hooked end ofthe rod P fits loosely in a hole in a cross-bar, Q, on the shoe,spanning it from side to side. The shoe vibrates about-the rod, anddelivers the substance to be ground either into a funnel inserted in themouth of the feed-pipe Q or in the eye-hub or bushing H, as fullyexplained in the previous patent referred to.

I claim as my invention- 1. The combination of the supporting-frame, therunning stone, the casin g, the drivingshaft, the loosely-envelopingsleeve on the shaft, having enlarged recessed ends or boxes, and theself-adjusting removable bushings, in which the driving-shaft is fitted,substantially as and for the purposes hereinbefore set forth.

2. The combination, with the self-adjusting plate or turning cam,yieldingly held in position, of the stationary or bed stone, its casing,and devices which support the stone upon said cam, substantially asdescribed, whereby the stone is normally sustained in proper positionrelatively to the runner, while left free to yield automatically by theturning of the cam to allow clogging matter injurious to the stones toescape, in the manner set forth.

3. The combination, substantially as hereinbefore set forth, of thestationary or bed stone, its pivots, the casing, the guideways ors0ckets on the inside of the casing-wall or periphery, and theadjustable bolts, having heads movable in the guideways and providedwith bearings for the pivots of the stone.

4; The combination, substantially as hereinbefore set forth, of thecasing, the adjusting-bolts, having shoulders or collars, the adjustablescrew-attached heads of the bolts, the stone pivoted in said heads,bearingblocks on the bolts, and the adjusting-plate or turning cam uponwhich the shoulders of said bearing-blocks are supported.

5. The combination, substantially as hereinbefore set.forth, of thecasing, the stationary or bed stone, its adjust-able clampingband,provided with pivots, the yieldingly-secured adjusting-bolts, theiradjustable heads supporting the stone on the pivots, shoulders orcollars on the bolts, the adjustable bearingblocks acted upon by saidcollars as the bolts are adjusted, and the adjusting-plate or turningcam, upon which the blocks bear, and by which the stone is moved towardor away from the casing-back.

6. .The combination, substantially as hereinbefore set forth, of thestationary or bed stone, its casing provided with guideways upon theinner wall or periphery, the adjusting-plate or turning cam, theendwise-moving rod for controlling said plate, the hand wheel or nutthereon, the spring or yielding cushion be tween said wheel and thecasing, the adjusting-bolts, having heads movable in theeasing-guideways and supporting the stone on its pivots, and theadjustable shouldered blocks on said bolts bearing upon the cams of theadj usting-plate, whereby the stone may be ad justed as desired, andfirmly held in its position under ordinary circumstances, and yetbecapable of yielding under unusual strain by the compression of thecushion on its controlling-rod, to allow the escape of clogging matterand prevent injury to the stones, as set forth.

7. The combination, substantially as hereinbefore set forth, of thecasing, its sockets, the hopper frame or bracket, formed of a bent rodfitting in said sockets, the shaking-lever, the shoe, the ferrulefitting upon the end of the shaking-lever, and the rod adjustablysecured upon one of the ends or posts of the hopper-frame and supportingthe outer end of the shoe.

In testimony whereof I have hereunto subscribed my name.

AUSBERT H. IVAGNER W'itnesses FRANK W. Evans,

CHARLES L. PRArr.

